* source.c (get_current_source_symtab_and_line): Initialize sal.pc and

	* source.c (get_current_source_symtab_and_line): Initialize sal.pc and
	sal.end fields.
	(get_current_or_default_source_symtab_and_line): Ditto.
	* breakpoint.c (parse_breakpoint_sals): Use correct accessor function
	so we do not cause a new source symtab to be searched for (reverting an
	unintentional change from the 2002-09-20 patch).
	* scm-lang.c (scm_unpac): Ditto.